Fixes #12408 - Fix typo in stream name (#12409)

* Upcase H2 headers

* Fix structure of About files

* Fix typo in stream name

Author: sdwheeler

reference/5.1/Microsoft.PowerShell.Core/About/about_Pipelines.md

@@ -1,7 +1,7 @@
 ---
 description: Combining commands into pipelines in the PowerShell
 Locale: en-US
-ms.date: 12/05/2023
+ms.date: 10/02/2025
 online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/about/about_pipelines?view=powershell-5.1&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: about_Pipelines
@@ -151,7 +151,7 @@ PS> ipconfig.exe | Select-String -Pattern 'IPv4'
 ```
 
 > [!IMPORTANT]
-> The **Success** and **Error** streams are similar to the stdin and stderr
+> The **Success** and **Error** streams are similar to the stdout and stderr
 > streams of other shells. However, stdin isn't connected to the PowerShell
 > pipeline for input. For more information, see
 > [about_Redirection][07].

reference/7.4/Microsoft.PowerShell.Core/About/about_Pipelines.md

@@ -1,7 +1,7 @@
 ---
 description: Combining commands into pipelines in the PowerShell
 Locale: en-US
-ms.date: 12/05/2023
+ms.date: 10/02/2025
 online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/about/about_pipelines?view=powershell-7.4&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: about_Pipelines
@@ -151,7 +151,7 @@ PS> ipconfig.exe | Select-String -Pattern 'IPv4'
 ```
 
 > [!IMPORTANT]
-> The **Success** and **Error** streams are similar to the stdin and stderr
+> The **Success** and **Error** streams are similar to the stdout and stderr
 > streams of other shells. However, stdin isn't connected to the PowerShell
 > pipeline for input. For more information, see
 > [about_Redirection][07].

reference/7.5/Microsoft.PowerShell.Core/About/about_Pipelines.md

@@ -1,7 +1,7 @@
 ---
 description: Combining commands into pipelines in the PowerShell
 Locale: en-US
-ms.date: 12/05/2023
+ms.date: 10/02/2025
 online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/about/about_pipelines?view=powershell-7.5&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: about_Pipelines
@@ -151,7 +151,7 @@ PS> ipconfig.exe | Select-String -Pattern 'IPv4'
 ```
 
 > [!IMPORTANT]
-> The **Success** and **Error** streams are similar to the stdin and stderr
+> The **Success** and **Error** streams are similar to the stdout and stderr
 > streams of other shells. However, stdin isn't connected to the PowerShell
 > pipeline for input. For more information, see
 > [about_Redirection][07].

reference/7.6/Microsoft.PowerShell.Core/About/about_Pipelines.md

@@ -1,7 +1,7 @@
 ---
 description: Combining commands into pipelines in the PowerShell
 Locale: en-US
-ms.date: 12/05/2023
+ms.date: 10/02/2025
 online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/about/about_pipelines?view=powershell-7.6&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: about_Pipelines
@@ -151,7 +151,7 @@ PS> ipconfig.exe | Select-String -Pattern 'IPv4'
 ```
 
 > [!IMPORTANT]
-> The **Success** and **Error** streams are similar to the stdin and stderr
+> The **Success** and **Error** streams are similar to the stdout and stderr
 > streams of other shells. However, stdin isn't connected to the PowerShell
 > pipeline for input. For more information, see
 > [about_Redirection][07].